Drag-saw



UNITED STATES? JAMES CARROTHERS,

PATENT trice.

or ErwonTH, onrof D RAe SAW'.

SPECIFICATIONvformng part of Letters Patent No. 612,088, dated October11, 1898.

Application met :ruhe 19, m97. stiamo. 641,449. (Nomade.)

To all whom it may concern.'

Beit known that I,fJ AMES CARROTHERS, a citizen of the United States,residing at Epworth, in the county of Richland and State of Ohio, haveinvented certain new and usefulr Improvements in Drag-Saws; andl dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use thesame.

My invention relates to improvements in drag-saws, and has specialreference to certain new and useful improvements upon that constructionof drag-saw illustrated, described, and claimed in United States PatentNo. 229,091, granted me June 22, 1880.

The objects of my invention, together with the advantages thereof, willhereinafter appear in the following description and will be particularlypointed out in the claims.

Referring to the drawings, Figures vl and 2 are opposite side elevationsof the drag-saw embodying my improvements. Fig.y 3 is a detail in frontelevation of the saw and its forward guide. v

Similar numerals of reference indicate similar parts in all the gures ofthe drawings.'

Rising from a pair of horizontal supportingsills 1 are front and rearpairs ofvertical posts 2 and 3, respectively, the same4 being connectedby intermediate brace-timbers 4, which are in turn strengthenedbyfinclined brace-timbers 5. Any means maybe employed for givingrigidity to the framework.

ln opposite bearings 6, applied to the rear faces of the rear posts 3,are j ournaled theopposite ends of a rock-shaft 7, which supports therocking lever 8. The rocking lever 8 is pivoted above its center and iscurved or bow-shaped, as shown. Perforated lugs 9 project rearwardlyfrom the rocking lever adjacent its ends, and these lugs are connectedby a truss-rod 10, supported at its center by a strut-lug 11, a nut 12being threaded on the lower end of the rod. By a rod thus constructedgreat strength is given, and the strain to which it is subjected isdiffused over the entire lever, regardless of the point of applicationof the strain upon the lever.

In tranverse bearings 13, located at the front ends of the upperbrace-bars 4, is a shaft 14, which carries between the front posts 2 iofa bolt 19, is connected pivotally to a cuff or clevis 20. The cuff orclevis 20 is adjustably connected to the upper end of the rocking leverS by means of a bolt 21, the lever being providedwith a plurality ofholes, in

vany one of which the bolt maybe located, so

as to vary the point of` lconnection between the lever and pitman-rod,and thus vary the length of stroke of said rod.

If the machine is to be operated by power derived from a convenientsource, one end of the shaft 14 is preferably provided with a beveledgear 22, and the same intermeshes and receives its motion from acompanion beveled gear 23, located on the front end of an inclined shaft24, supported rotatably in bearings with which the brace 4 is provided.The rear end ofthe shaft 24 is connected by a gimbal-joint 25 to atumbling-shaft 2G, leading from the motor. in lieu of this means fortransmitting motion the end of the shaft 14 may-be provided with anordinary belt-pulley, the same receiving its motion by a systemmofbelting, or where it is desired to operate the machine manually by handa crank may be substitut-ed for. the gear 22.

J ournaled in bearings 27, located in transverse alinementon the sills1, isa transverse shaft 28, the same being provided at one end with ahand-lever 29,-rigid with the shaftand carrying a locking-pawl 30, thetooth of which automatically engages with the toothed locking standardor sector 3l, with which one of the sills is provided. Extendingupwardly from the shaft 28 at an angle thereto and rigid therewith is apair of segmental rockarms 32, the same being slotted for nearly theirentire length. These rock-arms 32 are spaced apart and between them issupported the saw-boX-S, from the under side of which lag-bolts 34extend, the same passing through the slots in the curved rock-arms andIt will be evident that IOO at its front end to the butt of the drag-saw37. The box 33, it will be understood, is slotted longitudinally, sothat the saw-teeth project through and below the bottom of the same.Loosely connected, as at 38, to the rear end of the saw-frame is a linkor yoke 39, the rear end of which is connected by a loose joint 40 to acuff or clevis 4l, bolted to the lower end of the rocking lever 8,heretofore mentioned. It will be obvious that by a manipulation of thehand-lever 29 the rock-arms 32 may be raised and lowered, causing thelag-bolts 34 of the saw-box to move within the curved slots with whichthe rock-arms are provided, and in this manner said boX may be raisedand lowered and carry with it the saw, whereby the latter is adjusted toany height in order to accommodate itself to the size of the log to besawed.

Pivoted, as vat 42, to the front posts 2 is a pair of arms 43, whichproject forward and have connected at their front ends a movablesaw-guide 44. The saw-guide 44 comprises a pair of opposite side pieces45, that are connected by a pair of bowed overlapping metal straps 46.This guide rests upon the saw near its outer end and serves to maintainthe saw in alinement against any possible lateral play until such timethat it shall have entered the log a sufficient distance to serve thispurpose, the guide lying on the top of the log as the saw enters.

The metal straps 46, herein mentioned, are merely light straps havingmore or less resiliency, their function being to permit of a certainamount of separation of the side pieces 45 comprised in the saw-guide.The guide, it will be observed, is of considerable length, so that thesaw is embraced loosely for a considerable portion of its length, whichis an advantage in drag-saws where hard knots and other obstructions areapt to cause buckling. The increased length of the guide rendersnecessary or desirable some provision for the yielding of the guide tothe play of the saw-blade.

I also prefer to employ a feed device for the logs, so that the same maybe conveniently fed at a point beneath the saw. For this purpose Ilocate opposite the sills l and at an angle 'thereto cross sills ortracks 47, surmounting the same with a pair of alining bearings 4S,which support a shaft 49. The shaft 49 between the bearings issurmounted with a rotatable rest 50, the same being preferably enlargedtoward that end adjacent to the saw-frame, as indicated at 5l, and thesurface of this rest is studded with spikes 52 for the purpose ofengaging with the fiber of the log and retaining the same during theoperation of sawing. As the out is made by the saw as the same isretracted, it will be observed that by enlarging the end of the restthat is nearest the frame such rest will resist any tendency upon thepart of the log to roll or tumble out of position. The shaft 49 isextended beyond one of its bearings and is, by means of a gimbal-joint53, connected to a short tumbling-shaft 54, located in bearings 55,formed on one of the posts 2 and on a short standard 56, with which oneof the sills l is provided. A loose beveled gear 57 is mounted on thetumbling-shaft 54, and is provided at its rear side with a clutch member58, into connection with which may be slid a clutch-sleeve 59, splinedon the tumbling-shaft 54 in rear thereof. A short lever 60 is fulcrumedon the standard 56, and at its lower end is forked, so as to looselyconnect with the sleeve 59. The upper end of the short lever 60 isloosely connected to the forward end of an actuating-rod 6l, the rearend of which is pivoted, as at 62, to an intermediary point upon ahand-lever 63, whose lower end is fulcrumed, as at 64, on one of thesills l. In vertically-alining bearings G5, applied to one of the frontposts 2, there is journaled a vertical shaft 66, the lower end of whichis provided with a small beveled pinion 67 and the upper end of which isprovided with a beveled gear 68. The pinion 67 is in constant mesh withthe beveled gear 57 and the gear 68 is likewise in constant mesh with asmall beveled gear 69, located on the adjacent end of the crank-shaft14.

It will be evident that motion will be imparted from the crank-shaft tothe rocking lever 8 and by the lower end of the latter to the saw-blade;also, that the vertical shaft 66 will be constantly rotated and that bythrowing the lever 63 to the rear the clutch-sleeve 59 will be throwninto engagement with the toothed hub or clutch member of the gearwheel57, so that motion will be imparted from the vertical shaft 66 to thegear 67, from thence to the gear 57, and by the latter to the clutch 59and tumbling-shaft 54, and from thence, by means of the gimbal-joint 53,to the rotatable rest 50. Such motion upon the part of the rest willcause the log to be advanced for the purpose of commenc` ing a new cut.It will be seen that the relative sizes of the gears for transmittingmotion to the log-rest are such as to cause the log to be comparativelyslowly fed. As soon as a suicient length of log has been advanced or fedthe hand-lever is thrown to the front, thus arresting the movement ofthe rest by a disconnection of the clutchsleeve.

A keeper 65a is located upon the outer side of one of the front vposts2, said keeper and its post, upon which it is mounted, being providedwith alining holes for the accommodation of an adjusting and pivotingbolt 66, that passes through an intermediary point on a holding orclamping bar 67a, that projects beyond the front and rear of the frame.The rear companion piece 3 is provided with a toothed rack-bar 68, withwhich the rear inner portion of the holding-bar 67n engages. Byarranging the bolt 66a in suitable holes, with which the keeper 65a isprovided, it will be seen that the said holding-bar may be IIO IZO

raised and lowered in accordance with the size of log to be ont. Whenthe log is in position upon the rest, by raising the rear end of theholding-bar the front end of the same, which is provided with spikes, iscaused to clamp the log, the rear end of the bar automatically engagingwith the teeth of the rackbar, so that the bar becomes locked inposition by being sprung into said teeth.

At the opposite side of the machine I pivot to one of the braces of theframe, as at 69a, a hand-lever 70, the front end of which is connectedby means of a loose link 7l to the rear end of an inclined gravity-bar72, the upper face of which is provided with teeth and the lower frontend of which rests upon the ground in rear of the log-rest. This bar isfor the purpose of throwing the cut log clear of the rest and out of thepath of the advancing log and is operated by a depression of thehand-lever 70. It will of course be understood that any ordinary truckis employed for skidding the log to the rest7 such truck forming no partof my invention, and therefore not being shown. The truck, however, ismounted on the track 47.

It is proposed to build the machine described either stationary ormovable, and in the latter instance it is intended to provide the samewith an ordinary axle and wheels by means of which the machine may bemoved from one point to another, and when it is desired to operate themachine the wheels and axles are of course removed and the machineanchored to position, such features being common to the machines foranalogous purposes.

I-Iaving described my invention, what I claim isl. The combination witha drag-saw, of the arms, 43, pivoted to the front posts'of the frame andextending to opposite sides of the saw and the guide comprising theopposite independent side pieces secured to the arms and the yieldingarched metallic straps embracing said side pieces and connecting thesame.

2. In a drag-saw, the combination with a framework, a power-shaft, a sawand means for conveying motion from the power-shaft to the saw, of alog-rest, a tumbling-shaft connected therewith, a loose gear arranged onthe tumbling-shaft and having a toothed hub, a clutch f sleeve splinedon the tumbling-shaft, alever connected with the clutchsleeve, ahand-lever and connection between the same and clutch-lever, anintermediate shaft, gears on the ends of the same, the lower one ofwhich meshes with the loose gear, and a gear on the power-shaft meshingwith the remaining gear.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES CARROTHERS.

Witnesses:

LEwIs MCCRAY, LEVI W. SrnvENsoN.

